[
https://issues.apache.org/jira/browse/SPARK-22113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16180162#comment-16180162
]
Michael Fu commented on SPARK-22113:
------------------------------------
Hi [~viirya], Thanks for investigating. I did my test according
[sql-programming-guide|http://spark.apache.org/docs/latest/sql-programming-guide.html]
The reason why I access Hive(actually it's Impala here) via JDBC in spark is we
integrate KUDU with Impala. So for any delete/update operation, I have to talk
with JDBC.
And for any query operation, I will obviously choose init session with
_enableHiveSupport_ which is recommended by document.
But why I raise this query operation issue is because I want to make sure all
JDBC operations work well in spark, so I could use it in production without
concern.
BTW: I raised a [question in
stackoverflow|https://stackoverflow.com/questions/46355882/dataset-shows-in-hive-is-inconsistent-with-jdbc]
before I come here. There's a comment in there, hope it help.
> Dataset shows in Hive is inconsistent with JDBC
> -----------------------------------------------
>
> Key: SPARK-22113
> URL: https://issues.apache.org/jira/browse/SPARK-22113
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Environment: version 2.2.0
> Reporter: Michael Fu
>
> I am trying to query data from Hive in spark. According spark-sql document,
> there're two ways to do this:
> The first way is Init session with _enableHiveSupport_
> {code:java}
> SparkSession session =
> SparkSession.builder().enableHiveSupport().getOrCreate();
> session.sql("select dw_date from tfdw.dwd_dim_date limit 10").show();
> {code}
> the dataset shows the correct result
> !https://i.stack.imgur.com/gBJCj.png!
> The second way is through JDBC
> {code:java}
> Dataset<Row> ds = session.read()
> .format("jdbc")
> .option("driver", "org.apache.hive.jdbc.HiveDriver")
> .option("url",
> "jdbc:hive2://iZ11syxr6afZ:21050/;auth=noSasl")
> .option("dbtable", "tfdw.dwd_dim_date")
> .load();
> ds.select("dw_date").limit(10).show();
> {code}
> But the dataset only show the column name in the result rather than the data
> in the column
> !https://i.stack.imgur.com/FBMDN.png!
> The two pictures should be consistent I think. Any outstanding I missed ?
> Many thanks!
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
